Merge "Update VR HAL docs." into nyc-dev am: a7145d28d8 am: ca2bbf419f
am: 52edef3105

* commit '52edef3105c16be8d94f569a27c952e46a40e3fc':

Change-Id: I13b9286ba1615c4ee97f80281a17f9336df69acb